Messages in this thread | | | Date | Thu, 10 Jan 2002 11:22:25 +0100 | From | Jens Axboe <> | Subject | Re: [PATCH] PAGE_SIZE IO for RAW (RAW VARY) |
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On Thu, Jan 10 2002, Andrea Arcangeli wrote: > On Wed, Jan 09, 2002 at 11:28:39AM -0800, Badari Pulavarty wrote: > > Ben, > > > > By any chance do you have a list of drivers that assume this ? > > What does it take to fix them ? > > > > I think Jens BIO changes for 2.5 will fix this problem. But > > 2.4 needs a solution in this area too. This patch showed > > significant improvement for database workloads. > > I didn't checked the implementation but as far as the blkdev is > concerned the b_size changes without notification as soon as you 'mkfs > -b somethingelse' and then mount the fs. So it cannot break as far I can > tell. The only important thing is that b_size stays between 512 and 4k.
The concern is/was differently sized buffer_heads in the same request, ie b_size changing as you iterate through the chunks of one request.
-- Jens Axboe
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